Through running and pressure pump

ABSTRACT

The specification describes a reciprocating piston pump for manual or power driven operation. It comprises a piston, a cylinder for the piston, a piston tube carrying the piston and valves adjacent to an outer end of the piston tube ad to the other end of the pump for regulating flow through the pump. The valves are provided with means for operating them by mechanical friction on relative movement taking place between the piston tube and the cylinder.

[151 3,695,787 51 Oct. 3, 1972 United States Patent Kraus PrimaryExaminer-Carlton R. Croyle Assistant Examiner-Richard J. SherAttomey-Jacob L. Kollin Johann Kraus, Innsbruck, Austria June 4, 1970ABSTRACT The specification describes a reciprocating piston [21] Appl.No.: 43,354

pump for manual or power driven operation. It com- 52 US.c|..........................4.........417/s47, 417/552 prises a piston,a cylinder for the piston, a piston tube F04}, 39/10 carrying the pistonand valves adjacent to an outer .417/545, 546, 547, 552, 437,

[51] Int.

end of the piston tube ad to the other end of the pump [58] Field ofSearch.....

for regulating flow through the pump. The valves are provided with meansfor operating them by mechanical friction on relative movement takingplace between the piston tube and the cylinder.

[56] References Cited UNITED STATES PATENTS 2,678,006 5/1954Gray..........................4l7/547 FOREIGN PATENTS OR APPLICATIONS 3Claim, 2 Drawing Figures 829,407 3/1952Germany...................4l7/552 PATENTEU 3 1973 8 3 5 5 23 EMM E 1 5%3 .QH mm m I/ i a i r, A m 1 L m\\ N\ 1 THROUGH RUNNING AND PRESSRUEPUMP BACKGROUND OF INVENTION 1 Field to Which Invention Relates Thepresent invention relates to pumps of the suction and force type, andmore particularly to such pumps in which the liquid to be pumped iscaused to flow through a hollow piston rod or piston tube into thecylinder and then out at the other end of the pump.

2 The Prior Art Suction and force piston pumps have already beenproposed in which at both ends, in extensions of the piston tube, valvesare provided in the inlet and outlet connections. On displacement of thepiston in the cylinder, one of the tow valves is displaced in thedirection of travel of the piston while the other, moving along the samedirection, is closed. In this previously proposed form of constructionthe inlet valve was to be a gravity actuated valve which would come intoengagement with the valve seat when the corresponding position of thepump was reached and later came clear of the valve seat during theoperation of the pump. This offered the disadvantage in that the liquidpresent in the hoses connected with the pump and in the pump itselfcould not be passed back into the vessel from which the liquid wasremoved. Furthermore it was necessary to move the piston backwards andforwards a number of times, when the pump was held with its outletconnection downwards, in order to bring the inlet valve into the closedposition. The tubular piston first had to be completely filled withliquid, this being brought about by pumping the piston up and down,until the liquid brought the inlet valve into the closed position onfurther pumping. Furthermore the flow of liquid through the pump wasturbulent so that eddies were the result.

SUMMARY OF THE INVENTION The present invention consists in a suction andforce pump comprising a cylinder, a piston in the cylinder, a pistontube on which the piston is mounted, inlet and outlet connectionsprovided in the ends of the piston tube, inlet and outlet valvesarranged adjacent to'the connections, the valves being arranged to beoppositely opened and closedwhen the piston is moved in the cylinder,means for displacing the valves by mechanical friction, the valves beingcapable of being moved in relation to each other on movementof thepiston tube in the cylinder, elongated guide parts attached to'the twovalves respectively, the guide part of the outlet valve fitting insidethe guide part of the inlet valveand engaging it frictionally,resiliently acting shoe means on the guide part of the inlet valve forengaging the inside of the piston tube, the shoe means being arranged toengage an abutment face in the piston tube.

This construction results in the following advantages:

The valves can be moved into their open and closed positions as desiredin any position of the pump. Furthermore the liquid can be broughtabout'in any position of the pump. Furthermore the liquid can becompletely returned to the source, for instance, aliquid supply vessel,both from the pump and also from the hoses connected with the pump. Thepassage of the liquid in the pump is substantially non-turbulenLAsignificant advantage is that the pump can be produced by injectionmolding, something which was not possible with the pump previouslyproposed described above. Thus cheap mass production methods can be usedin the manufacture of the pump. The pump can be made of a syntheticresin material in accordance with the particular purpose.

LIST OF SEVERAL VIEWS OF THE DRAWINGS One embodiment of the invention isshown by way of example in the accompanying drawing.

FIG. 1 shows the pump with the inlet open and the outlet closed.

FIG. 2 shows the pump with the inlet closed and the outlet open.

The pump comprises a cylinder 1, preferably made of transparentsynthetic resin, with a coaxial outlet connection 2 whose diameter isless than that of the cylinder. At the position at which these two partsare connected together there is a conically constructed valve seat 3.The free end of the outlet connection has a screw thread 4 and aninternal conically narrowing part 5 on which there is mounted a suitableabutment part 6. On the thread 4 a tightening nut 7 is screwed fortightening up and holding a hose 8. On the valve seat 3 an outlet valve9 with a corresponding conical mating surface can come to rest so as toblock the outlet of the pump. The valve 9 is provided with a cylindricalguide part or stem. The valve 9 also has guiding abutment ribs 11 whichextend as far as the inner wall of the outlet connection 2.

The lower free end (see FIG. 2) of the guide stem 10 is of slightlyincreased diameter and is provided with several radial slots 12. Aninlet valve 13 is mounted on the guide stem 10 so as to allow relativemovement between them. The inlet valve 13 has a cylindrical guide stem14 which is hollow and receives the slotted end 12 of the guide stem 10of .the outlet valve. The cylindrical guiding stem or part .14 entrainsthe valve guiding stem 10 when the piston tube 15 is drawn out forsucking up fluid to be pumped. The piston tube 15 extends between thecylinder 1 and the guide part or stem 14. The piston tube 15 merges withan inlet connection .16 witha greater internal diameter. Its lower endis provided, like the outlet connection, with an external screw thread17. It has a .conically narrowing part 18 for the abutment part 19 and atightening nut 20 for holding and tightening up the hose2l. The abutmentpart 19 has a conical seat for a conicalinlet valve 13 which on its rearside has guide ribs 23 extending as far as the inner wall of the inletconnection 16. When the conical valve 13 comes to restv against the-seat22 the entry of liquid is shut off.

The cylindrical guide'part of stem 14 ends in three resilient shoes 24which lie against the inner wall of the piston tube 15. Inside thepiston tube 15 there is an abutment 25 for the shoes 24. The inner endof the piston tube 15 has an external recess 26 and a screw thread 27for receiving'holding rings 28- and 29 of hard plastics material.Between the rings 28 and 29 there are two sealing washers 30 and 31 ofelastic plastics material which are separated by a spacing ringi32. Theholding rings 28 and29 serve simultaneously for guiding the piston tube.

Further guidance is provided by a nut 33 which is screwed on thecylinder and. is provided at its inner edge with radially extendingprojections '34 of the same height around the piston tube, so that aircan pass into and out of the cylinder space 35 as the piston is movedinwards and outwards.

The manner of operation of the pump is as follows.

The cylinder is held in one hand. On pulling on the outer end of thepiston tube with the other hand, the inlet valve 13 with the guidingstem 14 and the resilient shoes 24 and the valve guiding stem with theoutlet valve 9 are entrained so that the outlet valve comes to restagainst the valve seat 3. On pulling further, a vacuum is created in thecylinder space so that the inlet valve 13 is lifted from the seat 22 andthe liquid inlet is opened. Still further drawing out of the piston tube15 leads to liquid being drawn into the pump and by a number of backwardand forward movements of the piston tube the liquid is' caused to fillthe cylinder. When this has been carried out the inlet valve 9 is raisedfrom its seat 3 so that the liquid can now run out freely. On pushing inthe piston tube 15 and its inlet connection 16 until the inlet valve 13abuts against the seat 22, the passage of liquid is blocked. On drawingout the piston tube, the procedure is repeated.

It is to be noted that the movement of the piston tube 15 both backwardsand forwards serves to drive air out of the inlet hose 21 and thecylinder for priming the pump. For siphoning the liquid from a vessellying at a higher level than the vessel to receive the liquid, theliquid can now flow freely through the pump. If it is desired to shutoff the liquid flow, the piston tube 15 with the inlet connection 16 ismoved into the cylinder until the inlet valve 13 comes to rest on theseat 22. if it is desired to fill another vessel, for example, the seat22 must be moved away from the inlet valve 13, this being carried out bypulling the piston tube 15 outwards together with the inlet connection16.

On the other hand, when the container to be filled with liquid is on thesame level as the vessel supplying the liquid or is at a higher level,it is necessary to pump continuously, using the piston tube.

Emptying of the pump itself can be carried out as follows; firstly theinlet valve 13 is brought into contact with the seat 22 by pressing inthe piston tube 15 together with its inlet connection 16, so that theliquid inlet is blocked. The remaining liquid which then practicallyonly remains in the piston tube can emerge through the opened inletvalve so that all liquid is removed from the pump. Following this, thepump with the outlet part directed upwards is lifted above the level ofthe vessel which is to be emptied and the inlet connection 16 with thepiston tube 15 is drawn out so that the inlet valve 13 is removed fromthe seat 22 and the outlet valve closes. In order to bring the twovalves 9 and 15 into the open position, it is necessary to move in thepiston tube 15 a little, together with the inlet connection 16. The aircan now pass through the outlet tube 15 with its inlet connection 16 sothat also the liquid in the hose can flow back into the vessel as well.

When the pump handle 16 is pulled out as shown in the position in FIG.1, the inlet valve 13, opens in the piston rod and the outlet valve 9closes on the outlet side. When the piston rod is pushed-in (FIG. 2),the inlet valve 13 arranged in the piston rod closes in the pump handleand the outlet valve 9 is opened by the friction of th drag art.24inside the workin barrel 15, as well as by the BICIIOII of the elasticend 15 of the drag bar 10 of the outlet valve 9 inside the drag tube 14of the inlet valve 13.

When filling liquids from higher vessels, the piston handle must bepulled out slightly. The inlet valve thus opens, and the outlet valve isopened, by the pressure of the liquid so that the liquid can continue toflow until the piston handle is again in its end position and the inletvalve 13 stops again the flow.

The pump in accordance with the invention can also be used in the formof a multiple unit with several such,

pumps as described, the drive of the piston tubes being carried outsimultaneously by means of levers, cranks or the like by hand or with amotor drive.

I claim:

1. A suction and force pump comprising a cylinder, a

piston displaceable in said cylinder, a piston tube having interiorwalls and an abutment face, said piston being mounted on said pistontube, said cylinder being provided with inlet and outlet means, inletand outlet valves adjacent said inlet and outlet means respectively,means for opening and closing said inlet and outlet valves when saidpiston is displaced in said cylinder including elongated guide elementssecured to said inlet and outlet valves, the guide element secured tosaid outlet valve being mounted interiorly of the guide element of saidinlet valve and in frictional engagement therewith, resilient shoe meanson said guide element secured to said inlet valve for engaging saidinterior walls of said piston tube, said shoe means being adapted toengage said abutment face of said piston tube.

2. A suction and force pump as claimed in claim 1, wherein said outletvalve is formed with guide and abutment ribs, and said inlet valve isformed with guide ribs.

3. A suction and force pump, as claimed in claim 1, wherein said guideelement secured to said outlet valve has an outside diameter slightlylarger than the inside diameter of the guide element secured to theinlet valve and is provided with a plurality of radial slots so thatsaid guide element secured to said outlet valve frictionally engages theinterior of the guide element secured to the inlet valve.

1. A suction and force pump comprising a cylinder, a piston displaceablein said cylinder, a piston tube having interior walls and an abutmentface, said piston being mounted on said piston tube, said cylinder beingprovided with inlet and outlet means, inlet and outlet valves adjacentsaid inlet and outlet means respectively, means for opening and closingsaid inlet and outlet valves when said piston is displaced in saidcylinder including elongated guide elements secured to said inlet andoutlet valves, the guide element secured to said outlet valve beingmounted interiorly of the guide element of said inlet valve and infrictional engagement therewith, resilient shoe means on said guideelement secured to said inlet valve for engaging said interior walls ofsaid piston tube, said shoe means being adapted to engage said abutmentface of said piston tube.
 2. A suction and force pump as claimed inclaim 1, wherein said outlet valve is formed with guide and abutmentribs, and said inlet valve is formed with guide ribs.
 3. A suction andforce pump, as claimed in claim 1, wherein said guide element secured tosaid outlet valve has an outside diameter slightly larger than theinside diameter of the guide element secured to the inlet valve and isprovided with a plurality of radial slots so that said guide elementsecured to said outlet valve frictionally engages the interior of theguide element secured to the inlet valve.